Clamp



Patented May 12., 1925.

UNITED STATES LE'WIS PIR-DUN, OF

TULSA, OKLAHOMA.

CLAMP.

Application tiled May 22,

To all whom t may concern:

Be it known that I, Lewis PIRDUN, a citizen of the United States, and a resident of Tulsa, in the county of Tulsa and State of Oklahoma, have invented certain new and useful Improvements in Clamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to clamps for use on the cables of well-drilling machines and has for its object the provision of a clamping mechanism by the use of which the line may be more rapidly, easily and firmly secured than has heretofore been done. The invention is illustrated in the accompanying drawings and consists in certain novel features which will be hereinafter first fully described and then particularly pointed out in the appended claims,

In the drawings;

Figure 1 is a side elevation of one jaw member;

Figure 2 is a bottom plan view of the clamp;

Figure 3 is an end elevation of the clamp.

The clamp consists, primarily, of two jaw members, 1, .2, hinged together by a pintle rod 3 inserted through interiitting hinge lugs 4; on the jaws in a well-known manner. The jaws are provided in their opposed flat sides with vertical line-receiving grooves 5 which, when the aws arel brought together, mate to encircle the cable7 and slips 6 of any preferred form are secured in the grooves by pins 7 so that cables of any diameter may be secured by selecting the proper slips which are supplied in various sizes for interchangeable use. At their upper ends, the jaws are provided with hooks 8 to engage the usual reins for connection with the temperscrew.

Extending laterally from the jaws, preferably midway their height, are the clamping or lever arms 9 and 10, respectively, which have their opposed sides flat and -flush with the opposed sides of the respective jaws. The arm 9 terminates in a cylindrical head 11 the axis of which is parallel with the axis of the groove 5 and thro-ugh which is fitted a bolt or pin 12 which, in turn, is engaged by the eyes 13 of eye-bolts 14. The outer ends of the eye-bolts carry and are bridged by a resistance and bearing bar 15 held adjust- 1924. Serial N'o. 715,151.

ably on the bolts by nuts 16 as will be understood. The end of the arm 1() fits between the eye-bolts and is provided on top and bottom with stop-lugs 17 against which the eyebolts abut when in clamping position, and on the outer side of the arm at the end thereof is formed a cam 18 to cooperate with the cam head 19 of a lever 20, said head 19 being rotatably fitted about the main clamping screw 21 and bearing at one side upon the cam 18 and at the opposite side upon the bar 15. The main clamping screw 21 eX- tends through and has threaded engagement with the bar 15 which acts as a nut for the screw when the latter is rotated. The screw is equipped at its outer end with a lever handle 22 whereby it may be easily rotated and its inner end is arranged to bear against the side of the arm concentric with the cam 1S formed thereon.

Assuming the clamp to be open, the arms 9 and 10 are passed at opposite sides of the line and the eye-bolts 14 swung around to pass across the end of the arm 10 thereby bringing the entire clamping assemblage into the position shown in Figs. 2 and 3, it being understood, of course, that the line is engaged between the slips. Immediately after the arms are swung together, the lever 2() is given a quarter turn to rotate the cam head 19 about the main screw 21, the arm 10 being thereby forced against the arm 9 so that positive contact between the jaws and the line will be effected. The cam head will bind between the bar and the cam 18 with sufiicient force tohold the clamp closed until the main clamping screw 21 can be turned home. The lever handle 22 may be spun so as to rapidly bring the end of the screw against the clamping arm 10, and then may be turned to put any needed pressure upon the clamping arms and through them upon the cable, the cam lever 2O returning to ini tial position as soon as the pressure thereon is relieved and taken up by the main screw. The provision of the intermediate cam saves time and labor in clamping the cable7 and the clamp is light in weight yet very strong and durable.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. In a cable clamp, a pair of pivotally connected jaw members, laterally swinging elements pivotally mounted on one jaw member to extend across the other' jaw member,

stops on the latter jaw member in the paths of the swinging elements and against which said elements abut, and means carried by the swinging elements to force the jaw members together.

9.. In a cable clamp, a pair of pivotally connected jaws, elements pivotally mounted at one jaw to extend across the other jaw, means carried by said elements to eiect an initial clamping movement of the jaws, and other means carried by said elements to effect iinal clamping movement of the jaws.

3. In a cable clamp, a pair of pivotally connected jaws, elements pivoted upon one of the jaws to extend across the other jaw, a bearing bar carried by said elements, a clamping screw mounted in said bar to engage against the last-mentioned jaw, and a cam loosely mounted on said screw and bearing against saidpjaw and against said bar.

4. In a cable clamp, a pair of pivotally connected jaws, elements pivoted on Ione jaw to extend across the other jaw, a bearing bar carried by said elements, and a cam rotatably supported between said bar and the last-mentioned jaw and bearing at one side against said jaw and at the opposite side against said bar.

5. In a cable clamp, a pair of pivotally connected jaws, elements pivoted on one jaw to extend across the other jaw, said other jaw having a cam formed on its side, a bearing bar carried by said elements, and a cam rotatably supported between said bar and the last-mentioned jaw and bearing at one side against the cam on said jaw and at the opposite side against said bar.

In testimony whereof, I have signed this specification in the presence of two subscribing Witnesses.

LEWIS PIRDUN.

IVitnesses:

WM. A. ROBINSON, H. J. ALLEN. 

